Awesome work, I ended up building a custom invoice builder as part of a larger custom SaaS for my wife & my local business, so this product resonates big time.

My random internet person's opinion: Instead of a 14-day trial, I think freemium is better where you can use it for up to X # of clients and if you want to go beyond some usage then you have to pay (e.g. Vercel, GitHub, etc. model).

For $9/mo, I would also expect React/Angular/Vue libraries to implement this into a larger project or other back office workflow - just my 2 cents!

Thanks for sharing, I love stuff like this.